The situation you are experiencing is quite common, even if you have followed the correct procedure. To avoid account restrictions, you should use real, complete information for both BM and personal accounts, create a clear landing page, do not use sensitive or misleading words, run gently at first, small budget to let the account "get used to it", do not share 1 card for multiple advertising accounts, IP or device for multiple accounts, if possible, verify BM early to increase stability. Facebook evaluates both accounts and behavior, so stability and transparency are the keys to long-term survival.